Wall protection in JET

JET has operated initially with graphite limiters and Inconel walls. An inspection after twelve months of operation showed damage to the inner wall, mainly due to runaway electrons. About 1 kg of Inconel was melted. To inhibit this source of metal contamination of the plasma -- metal droplets were deposited on the limiters -- 20 m2 of graphite tiles were installed at the inner wall. They will also act as protection against beam shine-through as soon as neutral injection becomes available. This paper describes the wall damage observed and the design and operational limits of the graphite protection and discusses the future plans. The present design will have to be modified to cope with loads of 2.5 kW/cm2 for up to 10s